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cruciverbals | 10:52 Tue 27th Oct 2015 | Crosswords
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20 DOWN: Film speed unit: D?N



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DIN

a formerly used logarithmic expression of the speed of a photographic film, plate, etc, given as –10log10 E, where E is the exposure of a point 0.1 density units above the fog level; high-speed films have high numbers http://www.collinsdictionary.com/dictionary/english/din
Din
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